Synonym: unreliable, unsafe, unsound, unsteady, unsure, weak. Antonym: stable. Similar words: constable, unstability, unsuitable, unstoppable, stable, unsustainable, detestable, instability. Meaning: adj. 1. lacking stability or fixity or firmness 2. highly or violently reactive 3. affording no ease or reassurance 4. suffering from severe mental illness 5. disposed to psychological variability 6. subject to change; variable.
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1. The world is a precarious and unstable place.
2. That chair looks a bit unstable to me.
3. The political situation is highly unstable.
4. David's mother was unstable and moody.
5. This bookcase is too unstable to hold so many books.
6. Prison order is rendered unstable by young inmates serving short sentences.
7. The building trade is notoriously unstable.
8. The political situation is still very unstable.
9. The wall was dangerously unstable.
10. The political situation remains highly unstable.
11. The situation is unstable and potentially dangerous.
12. Their politics consisted of unstable power-plays between rival groups.
13. His personality is a little unstable.
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14. The building was beginning to get unstable.
15. Both clay and sandstone are unstable rock formations.
16. It is a poor and politically unstable society.
17. The patient's condition was unstable.
18. Capitalist society is by its very nature unstable.
19. She was physically delicate and psy-chologically unstable.
20. Icebergs are notoriously unstable and are likely to turn over.
21. He was the most unstable kind of fool I had ever seen.
22. He was emotionally unstable.
23. Regimes governed by violence are always unstable.
24. The situation there remains very unstable.
25. These resonant orbits are very unstable.
26. A certain amount of care or pain or trouble is necessary for every man at all times.A ship without a ballast is unstable and will not go straight. 
27. After the fall of Pitt in 1801 there was a decade of unstable government.
28. The barrister represented to the court that the defendant was mentally unstable.
29. As last week's riots bear witness, the political situation is very unstable.
30. No one's going to put money into the company while the market is so unstable.
More similar words: constable, unstability, unsuitable, unstoppable, stable, unsustainable, detestable, instability, table, unsociable, unsolvable, notable, establish, unspeakable, mutable, potable, tableau, eatable, established, suitable, vegetable, portable, reputable, comfortable, immutable, irritable, tractable, countable, veritable, printable.